A display apparatus including: an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into the pixel circuit; a plurality of scan lines each provided for an individual one of rows of the pixel circuits arranged on the effective pixel section to control the conduction states of the switching devices; a plurality of capacitor lines each arranged for individual one of the rows connected to the pixel circuits; a plurality of signal lines each arranged for individual one of columns connected to the pixel circuits to propagate the pixel video data; a first driving circuit configured to selectively drive the scan lines and the capacitor lines; and a second driving circuit configured to drive the signal lines.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A display apparatus comprising: an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit; a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices; a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits; a plurality of signal lines respectively arranged for individual columns of said pixel circuits to propagate said pixel video data; a first driving circuit configured to selectively drive said scan lines and said capacitor lines; and a second driving circuit configured to drive said signal lines, wherein said second driving circuit includes a voltage driving circuit having a voltage boosting function for carrying out a voltage boosting operation to boost an input voltage having a level with a dynamic range insufficient for a gradation expression; said voltage driving circuit outputs a voltage obtained as a result of said voltage boosting operation or an unboosted voltage as a signal to one of said signal lines; and said voltage driving circuit has a select function for disabling said voltage boosting function for only a set of gradations determined in advance and implementing said voltage boosting function to boost said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance, wherein the voltage driving circuit boosts only a black side with large voltage variations by setting a gradation zero as the set of gradations determined in advance, such that the voltage driving circuit disables the voltage boosting operation only for the gradation zero.
A display apparatus features a matrix of pixel circuits, each with a switching device for writing pixel data. Scan lines and capacitor lines control each row of pixels, while signal lines propagate pixel data down each column. A first driver selectively drives the scan and capacitor lines. A second driver includes a voltage boosting circuit for the signal lines. This boosting circuit selectively boosts an input voltage for gradation expression, only disabling boosting for a pre-determined set of gradations. Specifically, voltage boosting is disabled only for black (gradation zero), boosting voltage variations on the black side.
2. The display apparatus according to claim 1 , wherein said voltage driving circuit carries out the voltage boosting function based on a capacitive coupling effect and does not make use of said capacitive coupling effect for the gradation zero.
The display apparatus from the previous description uses a voltage driving circuit that employs capacitive coupling for voltage boosting, except for black (gradation zero), where capacitive coupling is disabled. This means that the boosting circuit for the signal lines leverages a capacitive coupling effect to achieve the voltage boost required for accurate color representation, but it specifically bypasses this capacitive coupling mechanism when the pixel is supposed to display black.
3. A display apparatus comprising: an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit; a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices; a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits; a plurality of signal lines respectively arranged for individual columns of said pixel circuits to propagate said pixel video data; a first driving circuit configured to selectively drive said scan lines and said capacitor lines; a second driving circuit configured to drive said signal lines, wherein said second driving circuit includes a voltage driving circuit having a voltage boosting function for carrying out a voltage boosting operation to boost an input voltage having a level with a dynamic range insufficient for a gradation expression, said voltage driving circuit outputs a voltage obtained as a result of said voltage boosting operation or an unboosted voltage as a signal to one of said signal lines, and said voltage driving circuit has a select function for disabling said voltage boosting function for only a set of gradations determined in advance and implementing said voltage boosting function to boost said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance; a monitor circuit configured to detect an electric potential found as a midpoint of detected electric potentials appearing on positive-polarity and negative-polarity monitor pixels provided besides said effective pixel section, and corrects the center value of a common voltage signal with a level changing at predetermined time intervals on the basis of said detected potential midpoint, wherein each of said pixel circuits arranged in said effective pixel section includes a display element having a first pixel electrode as well as a second pixel electrode, and a storage capacitor having a first electrode as well as a second electrode, in each of said pixel circuits, said first pixel electrode of said display element and said first electrode of said storage capacitor are connected to one terminal of said switching device; in each of said pixel circuits, said second electrode of said storage capacitor is connected to said capacitor line provided for said individual row; and said common voltage with a level changing at time intervals determined in advance is supplied to said second pixel electrode of each of said display elements.
A display apparatus contains a matrix of pixel circuits, each with a switching device for pixel data writing. Scan and capacitor lines control each row, and signal lines propagate data down each column. A first driver selectively drives scan and capacitor lines, and a second driver contains a voltage-boosting circuit for the signal lines that boosts the input voltage unless it's a specific "black" gradation. A monitor circuit detects the midpoint potential between positive and negative polarity monitor pixels. It then corrects the center value of a common voltage signal (which alternates at set intervals) based on this midpoint. Each pixel circuit includes a display element (with two pixel electrodes) and a storage capacitor (with two electrodes). One electrode of the display element and one electrode of the storage capacitor connect to the switching device. The other storage capacitor electrode connects to the row's capacitor line. The common voltage signal is supplied to the second electrode of the display elements.
4. A method for driving a display apparatus, said display apparatus including an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit; a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices; a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits; a plurality of signal lines respectively arranged for individual columns of said pixel circuits to propagate said pixel video data; a first driving circuit configured to selectively drive said scan lines and said capacitor lines; and a second driving circuit configured to drive said signal lines, the method comprising: sending, in an operation to output a signal with a level according to a gradation expression to one of said signal lines, an input voltage having a level with a dynamic range insufficient for said gradation expression to said second driving circuit; disabling a voltage boosting function for only a set of gradations determined in advance; and boosting said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance; wherein said disabling and said boosting is carried out for a black side with large voltage variations by setting a gradation zero as the set of gradations determined in advance, such that the voltage boosting operation is disabled only for the gradation zero.
A method for driving a display apparatus with a matrix of pixel circuits, each including a switching device for writing pixel video data, comprises these steps. An input voltage, having a dynamic range insufficient for full gradation expression, is sent to a second driving circuit. A voltage boosting function is selectively disabled for a set of pre-determined gradations. The input voltage is boosted according to its level for all other gradations. Voltage boosting is disabled only for the blackest gradation (gradation zero), thus selectively avoiding voltage boosting for large voltage variations associated with black.
5. The method according to claim 4 , wherein said voltage driving circuit carries out the voltage boosting function based on a capacitive coupling effect and does not make use of said capacitive coupling effect for gradation zero.
The display driving method as described above involves a voltage driving circuit that uses capacitive coupling for voltage boosting, except when displaying black (gradation zero). In this case, the capacitive coupling effect is intentionally not utilized. This allows precise gradation control while preventing voltage aberrations when displaying black pixels.
6. An electronic equipment comprising a display apparatus including: an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit; a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices; a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits; a plurality of signal lines respectively arranged for columns of said pixel circuits to propagate said pixel video data; a first driving circuit configured to selectively drive said scan lines and said capacitor lines; and a second driving circuit configured to drive said signal lines, wherein said second driving circuit includes a voltage driving circuit having a voltage boosting function for carrying out a voltage boosting operation to boost an input voltage having a level with a dynamic range insufficient for a gradation expression, said voltage driving circuit outputs a voltage obtained as a result of said voltage boosting operation or an unboosted voltage as a signal to one of said signal lines, and said voltage driving circuit has a select function for disabling said voltage boosting function for only a set of gradations determined in advance and implementing said voltage boosting function to boost said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance, wherein the voltage driving circuit boosts only a black side with large voltage variations by setting a gradation zero as the set of gradations determined in advance, such that the voltage driving circuit disables the voltage boosting operation only for the gradation zero.
An electronic device contains a display apparatus with a matrix of pixel circuits, each containing a switching device for writing pixel data. Scan and capacitor lines control each row, and signal lines propagate data down each column. A first driver selectively drives the scan and capacitor lines. A second driver has a voltage boosting circuit for the signal lines. This booster selectively boosts an input voltage for gradation expression, only disabling boosting for a pre-determined set of gradations. Specifically, voltage boosting is disabled only for black (gradation zero), boosting voltage variations on the black side.
7. The electronic equipment according to claim 6 , wherein said voltage driving circuit carries out the voltage boosting function based on a capacitive coupling effect and does not make use of said capacitive coupling effect for gradation zero.
The electronic device containing the display from the description above uses a voltage driving circuit that employs capacitive coupling for voltage boosting, except for black (gradation zero), where capacitive coupling is disabled. This means that the boosting circuit for the signal lines leverages a capacitive coupling effect to achieve the voltage boost required for accurate color representation, but it specifically bypasses this capacitive coupling mechanism when the pixel is supposed to display black.
8. A method for driving a display apparatus, said display apparatus including an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit; a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices; a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits; a plurality of signal lines respectively arranged for individual columns of said pixel circuits to propagate said pixel video data a first driving circuit configured to selectively drive said scan lines and said capacitor lines; and a second driving circuit configured to drive said signal lines, the method comprising: sending, in an operation to output a signal with a level according to a gradation expression to one of said signal lines, an input voltage having a level with a dynamic range insufficient for said gradation expression to said second driving circuit; disabling a voltage boosting function for only a set of gradations determined in advance; boosting said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance; and detecting, by a monitor circuit, an electric potential found as a midpoint of detected electric potentials appearing on positive-polarity and negative-polarity monitor pixels provided besides said effective pixel section, and correcting the center value of a common voltage signal with a level changing at predetermined time intervals on the basis of said detected potential midpoint, wherein each of said pixel circuits arranged in said effective pixel section includes a display element having a first pixel electrode as well as a second pixel electrode, and a storage capacitor having a first electrode as well as a second electrode, in each of said pixel circuits, said first pixel electrode of said display element and said first electrode of said storage capacitor are connected to one terminal of said switching device; in each of said pixel circuits, said second electrode of said storage capacitor is connected to said capacitor line provided for said individual row; and said common voltage with a level changing at time intervals determined in advance is supplied to said second pixel electrode of each of said display elements.
A method for driving a display with a matrix of pixel circuits, each including a switching device to write pixel video data, operates as follows. An input voltage, with a limited dynamic range for gradation expression, is sent to a second driving circuit. Voltage boosting is selectively disabled for a pre-defined set of gradations. Input voltage is boosted based on its level for other gradations. A monitor circuit detects the midpoint potential of monitor pixels and corrects the center value of an alternating common voltage based on the midpoint. Each pixel has a display element (with two electrodes) and a storage capacitor (with two electrodes). One electrode of each connects to the switching device. The other capacitor electrode connects to the row's capacitor line. The alternating common voltage is supplied to the second electrode of each display element.
9. An electronic equipment comprising: a display apparatus including: an effective pixel section having a plurality of pixel circuits arranged to form a matrix, each pixel circuit including a switching device through which pixel video data is written into said pixel circuit; a plurality of scan lines respectively provided for individual rows of said pixel circuits arranged on said effective pixel section to control the conduction states of said switching devices; a plurality of capacitor lines respectively arranged for the individual rows of said pixel circuits; a plurality of signal lines respectively arranged for columns of said pixel circuits to propagate said pixel video data; a first driving circuit configured to selectively drive said scan lines and said capacitor lines; a second driving circuit configured to drive said signal lines, wherein said second driving circuit includes a voltage driving circuit having a voltage boosting function for carrying out a voltage boosting operation to boost an input voltage having a level with a dynamic range insufficient for a gradation expression, said voltage driving circuit outputs a voltage obtained as a result of said voltage boosting operation or an unboosted voltage as a signal to one of said signal lines, and said voltage driving circuit has a select function for disabling said voltage boosting function for only a set of gradations determined in advance and implementing said voltage boosting function to boost said input voltage to an output voltage according to the level of said input voltage for gradations other than said set of gradations determined in advance; a monitor circuit configured to detect an electric potential found as a midpoint of detected electric potentials appearing on positive-polarity and negative-polarity monitor pixels provided besides said effective pixel section, and corrects the center value of a common voltage signal with a level changing at predetermined time intervals on the basis of said detected potential midpoint, wherein each of said pixel circuits arranged in said effective pixel section includes a display element having a first pixel electrode as well as a second pixel electrode, and a storage capacitor having a first electrode as well as a second electrode, in each of said pixel circuits, said first pixel electrode of said display element and said first electrode of said storage capacitor are connected to one terminal of said switching device; in each of said pixel circuits, said second electrode of said storage capacitor is connected to said capacitor line provided for said individual row; and said common voltage with a level changing at time intervals determined in advance is supplied to said second pixel electrode of each of said display elements.
An electronic device has a display apparatus with a matrix of pixel circuits, each with a switching device for writing pixel data. Scan and capacitor lines control each row, and signal lines propagate data down each column. A first driver selectively drives the scan and capacitor lines. A second driver has a voltage boosting circuit. The booster selectively boosts an input voltage unless it's a "black" gradation. A monitor circuit detects the midpoint potential between positive/negative monitor pixels. It corrects a common voltage signal (alternating at intervals) based on the midpoint. Each pixel has a display element (with two electrodes) and a storage capacitor (with two electrodes). One electrode each connects to the switching device. The other capacitor electrode connects to its row's capacitor line. The common voltage is supplied to the other electrode of the display elements.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
August 22, 2008
July 2, 2013
Browse 5M+ US patents with plain-English claim translations and AI-generated analysis.